Following the sudden death of a wealthy heir, Hercule Poirot must navigate a web of greed and deception within a family desperate to secure their inheritance. When Lynn Marchmont returns to her village after the war, she finds her family transformed by the arrival of a new, unexpected patriarch whose presence threatens their financial stability. Poirot is summoned to investigate a series of anonymous letters and a suspicious death, forcing him to confront the dark motivations of those who stand to gain from the tragedy. The narrative utilizes a classic third-person perspective, focusing on the psychological tension between the suspects and the methodical deduction of the detective.

This novel is frequently cited by enthusiasts of the genre for its sharp examination of post-war social shifts and the corrosive nature of sudden wealth. Readers often highlight the intricate plotting and the clever way Christie misdirects the audience through the shifting perspectives of the family members. The inclusion of Hercule Poirot provides a steady, analytical anchor amidst the emotional volatility of the Cloade family. It is regarded as a quintessential example of the author's ability to weave complex human motivations into a traditional whodunit structure.